Answer :
Infectious diseases are illnesses that are caused by organisms such as bacteria, viruses, fungi, or parasites.
There are numerous organisms that live in and on our bodies. They are typically harmless or even beneficial. However, some organisms may cause disease under certain conditions. Some infectious diseases are contagious. Some are spread by insects or animals. Others can be acquired through the consumption of contaminated food or water, or through exposure to organisms in the environment.
The signs and symptoms vary depending on the organism causing the infection, but fever and fatigue are common. Mild infections may respond to rest and home remedies, whereas severe infections may necessitate hospitalization.
Vaccines can prevent many infectious diseases, including measles and chickenpox. Handwashing frequently and thoroughly also helps protect you from the majority of infectious diseases.
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